| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // Author: morlovich@google.com (Maksim Orlovich) |
| // |
| // This contains SlowWorker, which runs (expensive) tasks in a background thread |
| // when it's not otherwise busy. |
| |
| #ifndef PAGESPEED_KERNEL_THREAD_SLOW_WORKER_H_ |
| #define PAGESPEED_KERNEL_THREAD_SLOW_WORKER_H_ |
| |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/string_util.h" |
| #include "pagespeed/kernel/thread/worker.h" |
| |
| namespace net_instaweb { |
| |
| class Function; |
| class ThreadSystem; |
| |
| // See file comment. |
| class SlowWorker : public Worker { |
| public: |
| // Initializes the worker. You still need to call ->Start to actually |
| // start the thread, however. (Note: start can return false on failure). |
| SlowWorker(StringPiece thread_name, ThreadSystem* runtime); |
| |
| // This waits for the running task to terminate. |
| virtual ~SlowWorker(); |
| |
| // If this SlowWorker's thread is currently idle, it will run the closure. |
| // Otherwise, the closure will simply be deleted. |
| // |
| // Takes ownership of the closure. |
| void RunIfNotBusy(Function* closure); |
| |
| private: |
| virtual bool IsPermitted(Function* closure); |
| |
| DISALLOW_COPY_AND_ASSIGN(SlowWorker); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // PAGESPEED_KERNEL_THREAD_SLOW_WORKER_H_ |